Cutting-tool.



No. 665,538. Patentd Ian. 8, mm.- C. P. MINGST. CUTTING TOOL.(Applicatic m filed. July 11-, 1900.

(No Model.)

r llld HM. 'unuulum CHARLES P. MINGST, OF EVANSVILLE, INDIANA.

CUTTING-TOOL.

SPECIFICATION forming part of Letters Patent No. 665,538, dated January8, 1901.

Application filed July 11, 1900. berial No. 253266- (IIo model.)

of lncliam hatginvented certain new and useful Improveme tsimOutting-Tools; and I.

do hereby declare the follfiing to be a full,

clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to cutting-tools for use on lathes and othermetal-working machines.

One object of the invention is the provision of a holder for a toolwhich will be much lighter than the forms of tool-holders at presentknown to the art, while being of such improved construction that agreater elasticity of the tool-clamping members of the split head orbody will be had.

Another object of the invention is the provision of a tool-holderadapted for holding the tool perfectly rigid,whereby all rattling isobviated.

Other objects are the provision of a novel form of tool-holder of thesplit head or body type which will only require one clampingscrew andwill be of such peculiar construction that great strength and lightnesswillbe obtained without impairing the elasticity of the tool-clampingjaws or effecting the durability of the device.

Having the foregoing objects in View, the invention consists of acutting-tool comprising certain improved features more fully set forthhereinafter and recited in the appended claims.

In the accompanying drawings, Figure 1 is a perspective Viewillustrating the form the tool-holder will assume when used with acutting-off tool or blade, the latter being shown in dotted lines; Fig.2, a side view of the tool as adapted for roughing-off work, the bladebeing shown in dotted lines; Fig. 3, a side View of the tool shown inFig. 1, disclosing the enlargement for the screw; Fig. 4, a perspectiveview of the tool of Fig. 2, taken from the opposite side; Fig. 5, asection taken on line or so of Fig. 1, and Fig. 6 a section taken online 'y y of Fig. 2.

Referring now to Figs. 1, 3, and 5, 1 desigthe working face ofthetool-head. The m.

or blade 3 has its sides inclined, at least its inner side, in orderthat it may lie snugly against the bottom or wall 6 of the seat. Theblade is wider at the top than at the bottom to prevent binding while acut is being made.

The numeral 8 designates a slit which extends entirely through the headof the toolholder, beginning at the forward end of the head and reachingback to the shank, at or about which point it is provided with anenlargement 9, ordinarily made by'drilling a' hole through the head atthis point. This enlargement or hole constitutes an important part oftheinvention, because I have found in practice that it gives the jawswhich clamp the blade or tool a much greater elasticity than they wouldotherwise possess, and it obviates the necessity of having a long cut orslit.

The two jaws on the split portion of the head are provided with anenlargement 10, which is internally screw-threaded for the singleclampingscrew 11 which I employ. My object in providing this enlargementis to give strength at the point Where the jaws are clamped together onthe blade without increasing the weight or size of the head any morethan is necessary, and by this construction I am enabled to dispensewithheavy block-like heads, such as now found necessary in tools of theclass to which my invention appertains. With the construction heretoforedescribed the jaws can be very rigidly clamped against the blade or toolwith little difficulty, whilethe blade is held tightly and cannot rattleor chatter or become displaced.

The form of my invention shown in Figs. 2, 4:, and 6 is so far asstructural features are concerned the same as that previously described,the main diiferencesbeing that the seat for the blade or tool isinclined downwardly, as is also the slit, while the shank of thetool-holder is straight and alined with the head or can be bent ineither direction, and the tool, known as a roughing-tool, need notnecessarily have its outer face flush or disposed below the side of thehead.

I am aware that the invention can be applied to the different forms oftools known to the art, and I do not therefore limit myself to the formsherein shown and described. I am also aware of the patents to Wood, No.-323,480, dated August 45, 1885; Whatley, No. 398,918, dated March 5,1889, and Hill, No. 622,625, dated April 4:, 1899,'aud I do nottherefore lay claim to any of the constructions therein shown ordescribed; but,

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

on one side with a seat for the cutting-blade,

said seat having undercut retaining portions or lips, the upper one ofwhich is an appreciably deeper undercut than the lower one, and the wallor bottom of said seat being inclined transversely, said head having aslit extending entirely through it and its seat and provided with anenlarged opening, said slit providing jaws and said jaws being providedwith alined internally-screw-threaded enlargements, a clamping-screwthreaded into said enlargements, and a blade or tool depending from itstop to its bottom to conform to the inclination of the bottom of theseat, and shaped to snugly engage the undercuts whereby rattling orchattering of the blade is obviated. In testimony whereof I affix mysignature in presence of two witnesses.

CHARLES P M INGST. Witnesses: I I V .OH/ASJVQ/TRAVIS,

GEORGE W. BOINK.

